en echelon

en echelon

[′en ‚esh·ə‚län]
(geology)
Referring to an overlapped or staggered arrangement of geologic features.
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References in periodicals archive ?
It appears that the rigid, en echelon shields formed by jointed arm branches are an adaptation to strengthening the crown and gathering food in highly variable, strong currents in a shallow reef or bioherm environment.
The granitic pegmatites form an 8 km-long, en echelon and lenticular swarm south of Cross Island dipping 45 north.
This range is characterized by eastwest to north-northeast trending parallel to en echelon, plunging anticline and syncline pairs that appear asymmetric to overturn in the form of fold train and dominantly south vergent.
Three of the faults, known as en echelon faults, were parallel but offset from each other, while the fourth fault was perpendicular to and crossed the first.
The en echelon 1 to 10 m-wide shear structures are persistent at depth and often merge in that direction too.
Une grande difference, a l'epoque, c'etait que les fonctionnaires du Parlement britannique devaient suivre une filiere qui leur permettait d'acquerir d'echelon en echelon toutes les competences voulues.
According to Hebert, "the Cortez district deposits which include Pipeline, Cortez Hills and now Goldrush lie in an en echelon pattern that trends from the northwest to southeast.
Generally the prospect has been previously interpreted as an en echelon shear system striking northwest and dipping 65 degrees to the south-west.
The pattern exhibits relatively short, en echelon fault segments of synthetic R and antithetic R' shears oriented at low- and high- angles to the main fault zone.
The major mineralized structures at the JAE property have a well-defined, north- northwesterly trend and steep easterly dip, with local en echelon offsets to the veins.
Each of these en echelon veins has a strike length of 250 to 400 meters, and an unknown down-dip extent.
These recently completed trenches in the San Antonio - Carmen zone have exposed a series of sub-parallel en echelon veins that extend 175 meters to the north of those previously reported trenching results with a width of more than 200 meters.